Improvement in tools for scaling tubes of boilers



JOHN DALEY AND JosnPH H. MAHv1Ln,OP PHILADELPHIA, PENNsYL- vANrA.

IMPROVEMENT IN TOOLS FOR SCALING TUBES OF BOILERS.

Specication forming part of Letters Patent No. 46,339, dated February 14, 1865.

1'0 @ZZ whom it may concern.'

Be it known -that we, JOHN DALEY and JOSEPH H. MARVILL, of the city and county of Philadilphia, and State ot' Pennsylvania, have invented a new and useful Boiler-Tube Scaling-Tool; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making apart of this specification, in-which- Figure 1 is a perspective view of the tool. Fig. 2 is an edge view of the guide D. Fig. 3 is a top view of the cutter-stock A. Fig. 4 is a top view of the circular cutter B. Fig. 5 is an edge view of the same.

Like letters in' all the figures represent the saine parts.

The nature of our invention consists of a tool for removing the scale or incrustation from the internal surface of the tubes of steamboilers. Its const-ruction and operation will be understood by the following description.

A is a cutter-stock, which is provided with perpendicular rows ot' cutters that project radially from its periphery. In the drawings but two cutters are represented in each row, yet a greater number may be used, it' desired.

The upper cutters, c, are shorter than the lower ones, b, the former cutting a portion of the depth of the scale, and the latter the re- 1nainder,or nearly so. These cutters are made double, running clear through round holes in the cutter-stock, the part of the cutters which they embrace being of corresponding form. This form of the holes we prefer, simply on account of convenience in its construction; otherwise square holes would be preferable.

B is a circular dish-'form cutter, which is secured on the lower end of the cutter-stock A by means of a screw, which passes through the central opening, c, ofthe cutter, as seen in Figs. 4 and 5, or in any other convenient manner. llhe object ofthe said cutteris to cut oit' the remaining portions of the scale which are left by the radial cutters a b. Itis slightly less in diameter than the inside of the tubes, to prevent its cutting the latter. The said cutter B also serves as a guide to keep the cutter-stock A in its central position as it' passes through the tube. The cutter-stock A is moved in its upward motion during the operation ot the cutters and in its return to the bottom of the tube by means of the central screw-shaft, O, the lower end of which is securely fastened in the upper end of the said stock by means of a screw formed on the shaft which fits in the opening (I, as seen in Fig. 3. The upper end ot' the shaft slides in the circular guide-piece D, which tits in the end of the tube, there being an annular ange, e, that lrests on its end.

E is a handle for operating the screw, there being a female screw in the former, which tits thereon. On the lower end vof the stock, and resting on the upper end of cutter-stock A, there is an lova guide, F, which' is somewhat smaller than the interiorpart of the in'- crustation of the tube, so as to pass freely through the same and act as a partial guide to the cutters, especially until the circular cutter B has entered the bottom of the tube.

The operation is as follows: The cutterstock Abeing placed in the bottom of the tube and the guide D in the upper end of the saine, the handle E is turned in the directionl of the arrow, causing the screw-shaft C to ascend in thetube to operate the radial cutters a b and the circular cutter B until they have passed through the incrusted part of the tub e,-

the scale by the operation of the cutters bein g made tine enough to pass through the openings f in the circular cutter B. The dish form of the cutter causes the particles to readily fall into the Openings which are toward its center, as seen in Figs. 4 and 5.

It will readily be seen that a great amount of time and expense may be saved by the use of this tool, inasmuch as the tubes may remain in the boilers until they are worn out, whereas they ordinarily have to be replaced with new ones as soon as the scales become so thick as to render them unserviceable,

1. rlhe combination and arrangement of the (utters a b in the eutter-s'o :k A, the cutterstork being operated by the central screwshaft, C, substantially as herein set forth.

2. The combination and arrangement of the circular: cutter B with the cutter-stock A, substantially as and for the purpose set forth.

3. The combination ofthe guide D `With the screw-shaft C, arranged in -relationto theu tubes, substantially as and for the purpose set forth. t*

4. The combination of Vthe guide F With the screw-shaft C, substantially in the manner described, and for the purpose specified.

1n testimony that the above is our invention we hereunto set our hands and seals, this 4th day of January, 1865.

JOHN DALEY. [L. S.] -JOSEPH H. MARVILL. [L. 

